Selected organic matter source indicators in the Orinoco,Nile and Changjiang deltas |
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| Institution: | 1. Department of Oceanography, Texas A&M University, College Station, TX 77843, U.S.A.;2. Department of Geosciences, University of Tulsa, Tulsa, OK 74104, U.S.A.;3. Second Institute of Oceanography, Hangzhou, China;1. Neurophysics Group, Department of Neurology, Charité – Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany;2. Department of Neurophysiology and Pathophysiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany;3. Motor and Cognition Group, Department of Neurology, Charité – Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany;4. Motor Neuroscience Group, Department of Neurology, Charité – Universitätsmedizin Berlin, Campus Virchow, Berlin, Germany;5. Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany;1. State Key Laboratory of High Performance Computing, National University of Defense Technology, Changsha, Hunan 410073, China;2. School of Computer, National University of Defense Technology, Changsha, Hunan 410073, China;3. State Key Laboratory of Mathematical Engineering and Advanced Computing, PLA Information Engineering University, Zhengzhou, Henan 450002, China;1. Division of Sport Science, Incheon, South Korea;2. Sport Science Institute, Incheon National University, Incheon, South Korea;3. Motor Behavior Laboratory, University of Florida, Gainesville, FL, USA;1. National Research Council (CNR) Institute of Translational Pharmacology, L''Aquila, Italy;2. Regional Center for Organ Transplantation (CRT), S. Salvatore Hospital, L''Aquila, Italy;3. Transplant Unit, S. Salvatore Hospital, L''Aquila, Italy;4. Department of Clinical Sciences and Biotechnology, University of L''Aquila, L''Aquila, Italy;1. Clinical and Experimental Neurolinguistics, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium;2. Cepos, Rehabilitation Centre, Rooienberg 21, B-2570 Duffel, Belgium;3. Department of Neurology & Memory Clinic, ZNA Middelheim General Hospital, Lindendreef 1, B-2020 Antwerp, Belgium;4. Reference Center for Biological Markers of Dementia (BIODEM), Laboratory of Neurochemistry and Behavior, Institute Born-Bunge, University of Antwerp (UA), Universiteitsplein 1, BE-2610 Antwerp, Belgium;1. Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology (IO), Chinese Academy of Sciences (CAS), Qingdao 266071, PR China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, PR China |
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| Abstract: | Carbon isotopic composition, carbon to nitrogen ratios, carbon preference (n-C23 to n-C32), and microscopic examination of selected samples were compared and contrasted as organic matter source indicators. The Orinoco, Nile, and Changjiang deltas were sampled and analyzed. The δ 13C of organic matter increased with distance offshore at all three locations. Organic carbon content decreased seaward on the Orinoco and Changjiang deltas but increased on the Nile delta. C/N ratios decreased regularly with distance offshore on the Orinoco delta, ranged from 10 to 25, and correlated positively with δ 13COM. Estimations of the relative input of marine versus terrestrial organic matter to the sediments was dependent on the parameter analyzed. These discrepancies were primarily due to the definition of end-member compositions and the fraction of the total organic matter that is measured by a given parameter. Multiple-source indicators must be measured and integrated and end-members must be properly defined in order to obtain realistic input estimates. |
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